Conditional Comments in IE »
Very rarely do I think that IE is a good browser. But I have to give them a tip of the hat for their conditional comments. This feature saved my butt, by allowing a construct something like this one:
<!--[if IE]>
<p>Welcome to Internet Explorer.</p>
<![endif]-->
Any browser other than IE simply ignores the useless comment. Meanwhile, IE steams full speed ahead and uses the enclosed information. Sweet.
